Unknown file at WordPress core warning by Wordfence

Hi everyone,
I got a high risk warning message from Wordfence plugin, that said there is an unknown file at wordpress core file system (it is wp-megamenu-nav-33.txt at wp-admin directory).
Then i made a search on the web for learning what is that file?
There is no info, only two users asked similar subject previously but can’t find the exact cause of this file is there.
I made some detailed checks at my wordpress site and i think found the cause of this.
If you try to export one of the menu and press “export mega menu” button and ignore the process. system create a text file to your wp-admin directory. In my case it is wp-megamenu-nav-33.txt

I think it is not a dangerous file, but need to be checked by WP Mega Menu and Wordfence plugin coders.

I hope this can be helpfull.